NetNewsWire/Shared/ArticleStyles/ArticleThemeDownloader.swift

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//
// ArticleThemeDownloader.swift
// ArticleThemeDownloader
//
// Created by Stuart Breckenridge on 20/09/2021.
// Copyright © 2021 Ranchero Software. All rights reserved.
//
import Foundation
import Zip
public class ArticleThemeDownloader {
public enum ArticleThemeDownloaderError: LocalizedError {
case noThemeFile
public var errorDescription: String? {
switch self {
case .noThemeFile:
return "There is no NetNewsWire theme available."
}
}
}
public static let shared = ArticleThemeDownloader()
private init() {}
public func handleFile(at location: URL) throws {
createDownloadDirectoryIfRequired()
let movedFileLocation = try moveTheme(from: location)
let unzippedFileLocation = try unzipFile(at: movedFileLocation)
NotificationCenter.default.post(name: .didEndDownloadingTheme, object: nil, userInfo: ["url" : unzippedFileLocation])
}
/// Creates `Application Support/NetNewsWire/Downloads` if needed.
private func createDownloadDirectoryIfRequired() {
try? FileManager.default.createDirectory(at: downloadDirectory(), withIntermediateDirectories: true, attributes: nil)
}
/// Moves the downloaded `.tmp` file to the `downloadDirectory` and renames it a `.zip`
/// - Parameter location: The temporary file location.
/// - Returns: Destination `URL`.
private func moveTheme(from location: URL) throws -> URL {
var tmpFileName = location.lastPathComponent
tmpFileName = tmpFileName.replacingOccurrences(of: ".tmp", with: ".zip")
let fileUrl = downloadDirectory().appendingPathComponent("\(tmpFileName)")
try FileManager.default.moveItem(at: location, to: fileUrl)
return fileUrl
}
/// Unzips the zip file
/// - Parameter location: Location of the zip archive.
/// - Returns: Enclosed `.nnwtheme` file.
private func unzipFile(at location: URL) throws -> URL {
do {
let unzipDirectory = URL(fileURLWithPath: location.path.replacingOccurrences(of: ".zip", with: ""))
try Zip.unzipFile(location, destination: unzipDirectory, overwrite: true, password: nil, progress: nil, fileOutputHandler: nil) // Unzips to folder in Application Support/NetNewsWire/Downloads
try FileManager.default.removeItem(at: location) // Delete zip in Cache
let themeFilePath = findThemeFile(in: unzipDirectory.path)
if themeFilePath == nil {
throw ArticleThemeDownloaderError.noThemeFile
}
return URL(fileURLWithPath: unzipDirectory.appendingPathComponent(themeFilePath!).path)
} catch {
try? FileManager.default.removeItem(at: location)
throw error
}
}
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/// Performs a deep search of the unzipped directory to find the theme file.
/// - Parameter searchPath: directory to search
/// - Returns: optional `String`
private func findThemeFile(in searchPath: String) -> String? {
if let directoryContents = FileManager.default.enumerator(atPath: searchPath) {
while let file = directoryContents.nextObject() as? String {
if file.hasSuffix(".nnwtheme") {
return file
}
}
}
return nil
}
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/// The download directory used by the theme downloader: `Application Support/NetNewsWire/Downloads`
/// - Returns: `URL`
private func downloadDirectory() -> URL {
FileManager.default.urls(for: .applicationSupportDirectory, in: .userDomainMask).first!.appendingPathComponent("NetNewsWire/Downloads", isDirectory: true)
}
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/// Removes downloaded themes, where themes == folders, from `Application Support/NetNewsWire/Downloads`.
public func cleanUp() {
guard let filenames = try? FileManager.default.contentsOfDirectory(atPath: downloadDirectory().path) else {
return
}
for path in filenames {
do {
if FileManager.default.isFolder(atPath: downloadDirectory().appendingPathComponent(path).path) {
try FileManager.default.removeItem(atPath: downloadDirectory().appendingPathComponent(path).path)
}
} catch {
print(error)
}
}
}
}